Greetings!
Since I failed to find a way to check existing bugs (way to many, and no exhaustive search), decided to put it here. Please delete this post if this bug is known.
This picture should tell the most of it:
It happened twice. I can’t tell how to replicate this bug with 100% case.
Once it happened upon exiting a cave via a second exit, with a new created character in it’s first game session.
Guess is - exiting to chars selection and getting back to the game, when explored areas become grayed, seems to be a way to avoid the issue.
(maybe something with caching the ‘FogOfWar’ chunks in RAM?)
Regards.
Edit. Above guess is wrong - reentering wont help. The third example (different map chunk):
